High-magnetism high-mechanical-strength bonded neodymium iron boron (NdFeB) permanent magnet and preparation method thereof

Abstract

The invention relates to a high-magnetism high-mechanical-strength bonded neodymium iron boron (NdFeB) permanent magnet and a preparation method thereof and belongs to the technical field of magnets. The high-magnetism high-mechanical-strength bonded NdFeB permanent magnet comprises NdFeB magnetic powders, a thermosetting resin, a curing agent and a lubricating agent, and the magnetic powders comprise metallocene macromolecule ferromagnetic powders and stainless steel powders. The preparation method includes firstly, evenly mixing the thermosetting resin, the curing agent and acetone; secondly, evenly mixing the NdFeB magnetic powders, the metallocene macromolecule ferromagnetic powders and the stainless steel powders; thirdly, adding a mixture obtained from the step two to a mixture obtained from the step one and evenly mixing the two mixtures; fourthly, performing drying and screening, adding the lubricating agent, and evenly mixing the mixtures to obtain a magnetic powder mixture; fifthly, using a compression molding machine to press the mixtures into a magnet green body; and sixthly, curing the magnet green body at the temperature of 175-200 DEG C to obtain the magnet. The magnet has the advantages of being convenient to prepare, high in magnetic property and mechanical strength, small in dimensional tolerance, convenient to subsequently barrel and grind and low in transportation and assembly loss of finished products.

Description

technical field [0001] The invention belongs to the technical field of magnets, in particular to a bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength and a preparation method thereof. Background technique [0002] At present, bonded NdFeB permanent magnet is a new type of magnetic functional composite material obtained by compounding binder and NdFeB permanent magnet powder, and has broad application prospects. Various non-magnetic polymers such as epoxy resin, nylon, polyphenylene sulfide, polyethylene, rubber, etc. have been studied, and low melting point metals Bi, Sn, Pb, Zn, Al, etc. are used as binders to prepare and produce bonding. Permanent magnet materials, and put into practical application. [0003] Bonded NdFeB permanent magnets are widely used in computer hard drives, optical drives, game consoles, printers, Qiwu micro-motors, and magnetic sensors. The preparation method is generally as follows: mixing NdFeB permanent mag...

AI Technical Summary

Problems solved by technology

The preparation method is generally as follows: mixing NdFeB permanent magnet powder, bonding resin, processing aid and other components according to a certain ratio, and then pressing the mixed magnetic powder according to a certain processing method. The commonly used processing technology is mainly There are three types: compression molding, injection molding, and extrusion molding. After the magnet is cured, ground, and coated, it becomes a magnet of a certain shape. Its main components include NdFeB magnetic powder that provides magnetic properties and as a binder. Thermosetting resins, and processing aids such as curing agents, accelerators, coupling agents, lubricants, etc., but the magnets obtained by the existing methods have technical problems such as poor magnetic properties, poor mechanical strength, and high subsequent grinding, transportation, and molding losses.